Results 51 to 60 of about 66,716 (273)

Utilization of Electronic Portal Imaging Device (EPID) For Setup Verification and Determination of Setup Margin in Head and Neck Radiation Therapy [PDF]

Iranian Journal of Medical Physics, 2020
Introduction: Radiation therapy involves a multistep procedure; therefore, the error in patient set up is an inherent part of the treatment. Main purpose of this study was to determine the clinical target volume (CTV) to planning target volume (PTV) in ...
vajiheh vejdani noghreiyan, shahrokh naseri, Mehdi Momennezhad   +2 more
doaj   +1 more source

Comparison of EPID portal dosimetry verification and RadCalc dose verification for VMAT treatment plans

Nowotwory
INTRODUCTION: Dosimetry verification is required before starting each treatment. The legal regulations do not clearly define one method of plan verification.
Adam Gądek, Dominika Plaza, Łukasz Sroka, Marta Reudelsdorf-Ullmann, Krzysztof Ślosarek   +4 more
doaj   +1 more source

Fricke and polymer gel 2D dosimetry validation using Monte Carlo simulation [PDF]

, 2016
Complexity in modern radiotherapy treatments demands advanced dosimetry systems for quality control. These systems must have several characteristics, such as high spatial resolution, tissue equivalence, three-dimensional resolution, and dose-integrating ...
Chacón Obando, D., Conejeros, R., Figueroa, R., Garcia, D., González, G., Malano, Francisco Mauricio, Mattea, Facundo, Romero, Marcelo Ricardo, Santibañez, M., Strumia, Miriam Cristina, Valente, M., Vedelago, José Alberto, Velásquez, J.   +12 more
core   +1 more source

Impact of dose rate on accuracy of intensity modulated radiation therapy plan delivery using the pretreatment portal dosimetry quality assurance and setting up the workflow at hospital levels

Journal of Medical Physics, 2015
The aim of this study was to examine the impact of dose rate on accuracy of intensity modulated radiation therapy (IMRT) plan delivery by comparing the gamma agreement between the calculated and measured portal doses by pretreatment quality assurance (QA)
Karunakaran Kaviarasu, N Arunai Nambi Raj, K Krishna Murthy, A Ananda Giri Babu, Bhaskar Laxman Durga Prasad   +4 more
doaj   +1 more source

Creating A Dynamic, Multi-Purpose Correction for Multiple Geometries and Field Sizes to Account for Off-Axis and Asymmetric Backscatter With Varian Portal Dosimetry

, 2016
Intensity modulated radiation therapy and volumetric modulated arc therapy are increasingly common in radiation therapy due to their benefits of target conformity and normal tissue sparing.
Manigold, Remy
core   +1 more source

Evaluation of an Electronic Portal Imaging Device for Transit Dosimetry [PDF]

Acta Oncologica, 1999
The possibility of using a commercially available electronic portal imaging device for transit dosimetry was investigated. The detection unit of the device comprises a metal plate/fluorescence screen and a camera. Basic parameters of this system were investigated: stability, detector uniformity, dose-response curve, field-size dependence and phantom ...
X, He, A, Van Esch, R, Reymen, D, Huyskens   +3 more
openaire   +2 more sources

Ultrasonic inspection and self-healing of Ge and 3C-SiC semiconductor membranes [PDF]

, 2020
Knowledge of the mechanical properties and stability of thin film structures is important for device operation. Potential failures related to crack initiation and growth must be identified early, to enable healing through e.g. annealing.
Colston, Gerard B., Edwards, R. S. (Rachel S.), Leadley, D. R. (David R.), Myronov, Maksym, Shah, V. A., Trushkevych, Oksana, Zhou, Leiqing   +6 more
core   +1 more source

Assessment of three-dimensional set-up errors in conventional head and neck radiotherapy using electronic portal imaging device

Radiation Oncology, 2007
Background Set-up errors are an inherent part of radiation treatment process. Coverage of target volume is a direct function of set-up margins, which should be optimized to prevent inadvertent irradiation of adjacent normal tissues. The aim of this study
Devi P Reena, Agarwal Jai, Kadam Avinash, Chopra Supriya, Gupta Tejpal, Ghosh-Laskar Sarbani, Dinshaw Ketayun   +6 more
doaj   +1 more source

All‐in‐One Analog AI Hardware: On‐Chip Training and Inference with Conductive‐Metal‐Oxide/HfOx ReRAM Devices

Advanced Functional Materials, EarlyView.
An all‐in‐one analog AI accelerator is presented, enabling on‐chip training, weight retention, and long‐term inference acceleration. It leverages a BEOL‐integrated CMO/HfOx ReRAM array with low‐voltage operation (<1.5 V), multi‐bit capability over 32 states, low programming noise (10 nS), and near‐ideal weight transfer.
Donato Francesco Falcone, Victoria Clerico, Wooseok Choi, Tommaso Stecconi, Folkert Horst, Laura Bégon‐Lours, Matteo Galetta, Antonio La Porta, Nikhil Garg, Fabien Alibart, Bert Jan Offrein, Valeria Bragaglia   +11 more
wiley   +1 more source

Verification and correction of geometrical uncertainties in conformal radiotherapy [PDF]

Archive of Oncology, 2005
Geometrical errors are presented as deviation between intended geometry of radiotherapy plan and real geometry of radiotherapy treatment. Total geometrical error is build up of smaller errors, which can be generally classified as set-up, organ motion ...
Mileusnić Dušan
doaj   +1 more source